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in-java-whats-the-difference-between-public-default-protected-and-private
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‎README.md

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* [将InputStream转换为String](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/read-convert-an-inputstream-to-a-string.md)
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* [将数组转换为List](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/create-arraylist-arraylistt-from-array-t.md)
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* [如何遍历map对象](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/iterate-through-a-hashmap.md)
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* [public,protected,private,不加修饰符。有什么区别呢?](https://github.com/giantray/stackoverflow-java-top-qa/blob/master/in-java-whats-the-difference-between-public-default-protected-and-private.md)
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> 代码规范
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- [Generating random integers in a range with Java](http://stackoverflow.com/questions/363681/generating-random-integers-in-a-range-with-java)
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- [Why is printing "B" dramatically slower than printing "#"?](http://stackoverflow.com/questions/21947452/why-is-printing-b-dramatically-slower-than-printing)
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- [What is a serialVersionUID and why should I use it?](http://stackoverflow.com/questions/285793/what-is-a-serialversionuid-and-why-should-i-use-it)
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- [In Java, what's the difference between public, default, protected, and private?](http://stackoverflow.com/questions/215497/in-java-whats-the-difference-between-public-default-protected-and-private)
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- [Converting String to int in Java?](http://stackoverflow.com/questions/5585779/converting-string-to-int-in-java)
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- [Is there a unique Android device ID?](http://stackoverflow.com/questions/2785485/is-there-a-unique-android-device-id)
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- [How to test a class that has private methods, fields or inner classes](http://stackoverflow.com/questions/34571/how-to-test-a-class-that-has-private-methods-fields-or-inner-classes)
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##Java修饰符:public,protected,private,不加修饰符。有什么区别呢?
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如下表所示,Y表示能访问(可见性),N表示不能访问,例如第一行的第3个Y,表示类的变量/方法如果是用public修饰,它的子类能访问这个变量/方法
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| 修饰符 | 类内部| 同个包(package)| 子类 | 其他范围 |
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| -------- | :--: | :--: | :--: | :--: |
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| public | Y | Y | Y | Y |
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| protected | Y | Y | Y| N |
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| 无修饰符 | Y| Y | N or Y(见说明)| N |
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| private | Y | N | N | N |
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说明:
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需要特别说明"无修饰符"这个情况,子类能否访问父类中无修饰符的变量/方法,取决于子类的位置。如果子类和父类在同一个包中,那么子类可以访问父类中的无修饰符的变量/方法,否则不行。
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译注:本来觉得很简单一个问题,没想记录的,但看到答案,才发现自己以前错了。我以前一直以为无修饰符和private是一样的,如果没给变量加修饰符,java就默认为private。
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stackoverflow链接:
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http://stackoverflow.com/questions/215497/in-java-whats-the-difference-between-public-default-protected-and-private

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